Don't break out of libevent from connection callback
Don't break out of libevent from connection callback

Let the thread notification callback perform that check.
Given that the callback iterates over all the connections it would
run over all of the connections for _all_ of the connections every
time it process one connection. Instead we want the thread
notification pipe to perform this check _once_.

Change-Id: Iba45c13823b24d189e0d273c2eae8dc8cc548e88
Reviewed-on: http://review.couchbase.org/116433
Tested-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@couchbase.com>
Reviewed-by: Dave Rigby <a09264da4832c7ff1d3bf1608a19f4b870f93750@couchbase.com>

daverigby/kv_engine,daverigby/kv_engine,daverigby/kv_engine,daverigby/kv_engine